A mechanic who fails to notice correlations in a laboratory experiment may ably diagnose your car trouble. Voters might have sensible views about the issues of the day even though the clunkiest computer on the market beats them in chess. It is hard to remain cavalier, however, if your mechanic affirms that cars run on sand instead of gasoline. How could anyone who holds this belief be trusted with a car? The error is directly relevant to practical decisions, and points its adherent in a dangerous direction. Roughly the same is true if voters think that the biggest item in the federal budget is
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